Ahmad ibn Muhammad from Ali ibn al-Hakam from Sayf ibn Umayrah from Abu Bakr who said:
Abu Abdillah عليه السلام, peace be upon him, said: “When you lead a group in prayer, then sit for a short while after you give the taslim.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 3, p. 304